Understand how capacitor works

We all know that the purpose of capacitor is to store charges. But how does it work exactly?

Capacitor is made of two plates with non conducting material in between.

The top plate has positive charge (or negative) and the bottom plate has negative charge (or positive). Because of this, positive and negative charges both attract each other, keeping each other in place (so they wont go other places)--this is a form of storage.

Why do we need a non-conducting material in between? Well, if we have a conducting material in between instead, then the plates cannot hold charges, which destroys the purpose of the capacitor.